Urushi

Based on the provided search results, there is no information about the Naruto character "Urushi." The search results mainly describe a character named "Amber, the Firefly Flutter" from the game Tower of Saviors. Amber is a fire-attribute Fairy-type character from the Mystic Gem series. She has an active skill called "Insect Barrier," which transforms the runes on the board into a fixed arrangement of "heart and fire" Fairy-type enhanced runes. Her leader skill, "Soul-Seizing Treasure," increases the HP and ATK of Fairy-type characters and has a healing effect based on eliminating runes. Amber also has special team skills that increase combos based on the number of heart runes and reduce damage received, while also being able to convert heart runes into other attributes after taking damage and deal damage. Her story background describes her experience in working with Diamond to rescue people during a fire, and the secret they kept. Amber eventually learned Diamond's real gender and decided to keep it a secret.